<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ol li {
            color: #ff0000;
        }

        :active {
            color: blue;
        }

        div {
            width: 500px;
            height: 800px;
            background-color: green;
        }

        div:active {
            background-color: pink;
        }
    </style>
</head>

<body>
    <ol>
        ol里面的都会
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
    </ol>

    <div>

    </div>

    <div>
    </div>
</body>

</html>